////
//// Created by admin on 2021/12/22.
////
//#include <iostream>
//
//using namespace std;
//
//int main() {
//    int i = 0, &ri = i;
//    cout << i << " " << ri << endl;
//    i = 5;
//    cout << i << " " << ri << endl;
//    ri = 10;
//    cout << i << " " << ri << endl;
//    return 0;
//}
